21513452304 has 40 divisors (see below), whose sum is σ = 55617243840. Its totient is φ = 7165883008.

The previous prime is 21513452263. The next prime is 21513452321. The reversal of 21513452304 is 40325431512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98319 + ... + 229550.

It is an arithmetic number, because the mean of its divisors is an integer number (1390431096).

Almost surely, 2^21513452304 is an apocalyptic number.

21513452304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21513452304 is an abundant number, since it is smaller than the sum of its proper divisors (34103791536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21513452304 is a wasteful number, since it uses less digits than its factorization.

21513452304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329247 (or 329241 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21513452304 its reverse (40325431512), we get a palindrome (61838883816).

The spelling of 21513452304 in words is "twenty-one billion, five hundred thirteen million, four hundred fifty-two thousand, three hundred four".